381results about "Surface tension analysis" patented technology

The invention discloses a capillary pressure and contact angle synchronous characterization method and device of a microfluidic fluid interface, and relates to the field of interface analysis and multiphase seepage in pore media, and the method comprises the following steps: based on a pre-configured pore, particle and fluid binary image, distinguishing and extracting a fluid-particle contact interface contour and an attack / defense fluid interface contour; fitting and determining the curvature radius of each fluid interface contour through a watershed region division algorithm and reordering smoothing of Fourier descriptors; generating a multi-level size pore space based on the pore binary image, and obtaining a pore overlook radius; calculating a necking angle in combination with the curvature radius and the multi-stage size pore space to obtain an apparent contact angle and an intrinsic contact angle; and calculating the capillary pressure of the attack / defense fluid interface by combining the curvature radius, the pore overlook radius, the chip depth and the interfacial tension. According to the invention, high-precision technical support is provided for micro-fluidic multiphase seepage research.

The invention belongs to the technical field of monitoring equipment, and discloses a supercritical carbon dioxide contact angle direct monitoring system and method.A first needle valve is connected with the bottom of a high-temperature and high-pressure reaction kettle, the other side of the first needle valve is connected with a supercritical carbon dioxide storage device, and a heater is arranged on the periphery of the columnar high-temperature and high-pressure reaction kettle; a sight glass is arranged on the side face of the high-temperature and high-pressure reaction kettle, a light source is arranged on the left side of the high-temperature and high-pressure reaction kettle, the top of the high-temperature and high-pressure reaction kettle is connected with a second needle valve, the other side of the second needle valve is connected with a water injection pump, and a CCD camera is arranged on the right side of the high-temperature and high-pressure reaction kettle and connected with a computer. The computer is connected with the high-temperature and high-pressure reaction kettle through the temperature sensor and the pressure sensor. According to the invention, the change of the contact angle of the supercritical carbon dioxide can be accurately monitored and analyzed in real time, and an effective tool is provided for researching the wettability of the supercritical carbon dioxide and the effects of anisotropy, cohesiveness, adsorptivity and the like of the surface of a material.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a method for detecting surface defects of an aluminum alloy plate with an epoxy coating. The method comprises the following steps: applying an epoxy coating doped with a zinc yellow pigment to an anodic oxide film to construct a coating test piece with a color difference indication function, and placing the coating test piece in a coastal atmospheric environment for exposure sampling. In the detection process, the gloss loss rate, the chromatic aberration, the contact angle, the defect area proportion and the corrosion current density are collected, a dynamic correction coefficient is calculated according to the hydrolysis degree of the zinc yellow pigment, all parameter thresholds are adjusted in a self-adaptive mode, and a threshold set is constructed. And in combination with scanning electron microscope image segmentation and Tafel extrapolation analysis, multi-source indexes are fused to judge whether the coating is invalid. According to the method, the hydrolysis behavior of the zinc yellow pigment can be tracked in real time, the judgment standards of optical, morphology and electrochemical indexes are automatically corrected, and the accuracy and reliability of failure detection of the epoxy coating aluminum alloy plate under the coastal service condition are improved.

The present disclosure relates to methods and apparatus for characterising an interaction between a stimulus and a liquid thin film. An aspect of the disclosure provides a spectroscopic ellipsometry apparatus for characterising an interaction between a stimulus and a liquid thin film, the apparatus comprising: a stimulator, configured to provide a stimulus to a liquid thin film disposed on a volume of liquid to generate a wave in the liquid thin film, the liquid thin film and the volume of liquid having an interface therebetween, light beam optics for illuminating an area of the liquid thin film with a light beam, the light beam having a first polarisation, and a light collector coupled to a detector for receiving the light beam after reflection by the liquid thin film, the light beam having a second polarisation after reflection by the liquid thin film; a wave measurement module coupled to the light collector and configured to provide surface wave data to characterise a Lucassen wave in the liquid thin film based on the second polarisation.

The utility model relates to the technical field of contact angle measuring instrument parts, in particular to an optical filtering module device for a high-temperature vacuum contact angle measuring instrument, which comprises a shell, an aperture adjusting mechanism and a filtering adjusting mechanism. The light filtering adjusting mechanism comprises a mounting cover, a mounting plate, a plurality of light filters and a plurality of positioning assemblies, the aperture adjusting mechanism comprises a driving assembly, two mounting rings, two rotating assemblies and a plurality of separation blades, and by arranging the aperture adjusting mechanism and the light filtering adjusting mechanism, scattered light emitted by the light source can be converted into parallel light; the problem that the contact angle measurement precision is reduced due to the fact that the boundary of the liquid drop is fuzzy due to light scattering is effectively avoided, and the use requirement is met.

The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.

The invention belongs to the technical field of refrigerants, and particularly relates to a visual measuring device and method for refrigerant liquid drops, and the device comprises a liquid drop sampling system, and a sampling cabin is connected with a capillary needle tube through a sampling valve, and the capillary needle tube is arranged along the gravity direction; a capillary needle tube of the high-pressure visualization system extends into an observation bin communicated with the sample injection bin; the visible windows are arranged on the opposite side walls of the observation bin, the observation platform is fixed in the observation bin and located between the visible windows and below the capillary needle tube, and the thermoelectric effect semiconductor is arranged on the observation platform; the pressure control system, the electric heating module and the semiconductor chilling plate are arranged on the sample injection bin, and the pressure micro-control unit is electrically connected with the two; the optical imaging system, the high-speed camera and the light source are arranged outside the visible window, and the computer is electrically connected with the two. Compared with the prior art, the problems that in the prior art, high-pressure sampling equipment which is high in cost and complex in operation is needed, and only the liquid drop contact angle can be measured are solved. According to the scheme, through the gravity action of the liquid working medium, sample injection in a high-pressure environment is achieved, and high-pressure sample injection equipment is not needed.

The utility model discloses a contact angle measuring instrument suitable for a photosensitive material, which comprises a base, a movable objective table arranged on the base, a camera shooting assembly and a support, the camera shooting assembly and the support are respectively arranged on two opposite sides of a driving assembly, a liquid dropping unit is arranged on the support, and the contact angle measuring instrument also comprises a photosensitive excitation assembly arranged on the support, the light source I is arranged on the bracket and is matched with the camera component; the photosensitive excitation assembly comprises a lamp holder fixed to the support and a light source II detachably connected with the lamp holder. According to the contact angle measuring instrument suitable for the photosensitive material provided by the utility model, the photosensitive excitation assembly is arranged to excite the characteristics of the measured photosensitive material, so that the measured photosensitive material presents a real reaction state in the testing process, and the contact angle can be measured more accurately; meanwhile, the original positions of the light sources II with different wavelengths can be replaced according to experimental requirements, the uniqueness of the positions of the light sources II is controlled, and the experimental requirements of photosensitive materials are met.

A surface performance evaluation device including memory and a processor coupled to the memory. The processor being configured to: acquire a captured image, which is a moving image of a test object on which a liquid is dispersed, and which is captured by a camera; quantify, based on the captured image that is acquired by the processor, a degree of diffusion of the liquid that is dispersed on the test object and diffuses; and evaluate a surface performance of the test object based on an index quantified by the processor.

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.

The invention relates to an alkali metal gas chamber anti-relaxation self-assembly molecular coating adsorption energy quantification method, which finally realizes the physical quantification of the anti-relaxation coating adsorption energy by establishing a contact angle and surface topography collaborative characterization model and combining an adsorption-desorption dynamic formula, and is characterized by comprising the following steps: 1) establishing a contact angle and surface topography collaborative characterization model; depositing organosilane on a gas chamber glass substrate by adopting a liquid phase self-assembly method to form an anti-relaxation coating sample; step 2, selecting a plurality of measuring points on the anti-relaxation coating sample, dropping a 1 [mu] L ultrapure water liquid drop on each measuring point, determining a polarization retention angle of each measuring point according to the liquid drop height and the liquid drop substrate radius obtained by a contact angle measuring instrument, and scanning a local area of the corresponding measuring point by using an atomic force microscope (AFM), extracting an arithmetic mean value Ra of the surface roughness parameter and a root-mean-square value Rq of the surface roughness parameter as quantitative indexes of the polarization maintaining cross section; and step 3, taking free energy formed by the molecular layer of the coating as coating adsorption energy delta G.

The invention provides an experimental device for measuring a rock wetting contact angle and a measuring method thereof, and belongs to the technical field of rock physical property measurement, the experimental device comprises an ISCO constant-pressure constant-speed pump, a piston container, a control switch, a constant-temperature circulating system and an image processing system, the ISCO constant-pressure constant-speed pump is connected with the piston container through a first pipeline, and the piston container is connected with the control switch through a second pipeline; the ISCO constant-pressure and constant-speed pump is used for accurately injecting fluid at constant pressure and constant speed, the piston container is connected with the constant-temperature circulating system through a second pipeline and used for storing liquid, the constant-temperature circulating system is connected with a software interface of the ISCO constant-pressure and constant-speed pump and used for conducting experimental testing and adjusting temperature and pressure, and a control switch is arranged on the second pipeline. And the image processing system is connected with the constant-temperature circulating system and is used for calculating the wetting contact angle of the two-phase fluid in the shot image. The device provided by the invention realizes real-time dynamic monitoring of wettability under the conditions of different pore pressures, different pore diameters and various displacement media.

The invention discloses an experiment-numerical value-machine learning fusion-based in-oil liquid drop electric field dynamics modeling and regulation method, which comprises the following steps of: firstly, constructing a high-voltage electric field liquid drop experiment system, and testing oil liquid drop experiment data in oil; then establishing a multi-physics field coupling model, and describing deformation and flow field evolution of oil drops in oil under a strong electric field; and finally, constructing a BP neural network and optimizing an initial weight and a threshold value to realize rapid prediction of the deformation behavior of the oil drops in the oil under the action of the electric field. According to the method, an experimental characterization-numerical solution-machine learning optimization three-layer collaborative system is constructed, a whole-process closed loop from physical property determination, equation solution to algorithm prediction is realized, and droplet deformation, charge distribution and interface response are rapidly predicted under the conditions of different electric field intensities, temperatures and emulsifier concentrations; and active control of electric field behaviors can be realized through parameter reverse adjustment, and reliable modeling and optimization basis is provided for an electrowetting chip, a flexible EHD pump and a microfluidic liquid drop regulation and control system.

The invention relates to a system for identifying a liquid from data of an image of a drop (10) of this liquid on a reflective surface (12), comprising: a) means for estimating, from said image data, the contact angle and the capillary length of the drop placed on this surface; b) means for comparing the contact angle and capillary length estimations with known data of contact angles and capillary lengths of a drop of another liquid and for identifying the nature of the liquid of the drop to be identified. figure 4

The invention provides a layer-by-layer self-assembled gallium-lysozyme composite antibacterial stainless steel coating and application thereof, and relates to the technical field of medical equipment. According to the composite antibacterial stainless steel coating, medical 316L stainless steel is used as a substrate material, a dopamine solution is used as a raw material, Tris salt is added to initiate a polymerization reaction of dopamine, and a polydopamine film is formed on the surface of the stainless steel; the preparation method comprises the following steps: carrying out Michael addition reaction on an easily oxidized catechol group and lysozyme containing amino and sulfydryl in an aerobic environment to form stable covalent linkage, thereby preparing the lysozyme-loaded polydopamine composite membrane. In the invention, the antibacterial composite coating aims to effectively kill biofilm embedding bacteria and prevent bacterial adhesion and biofilm formation on the surface of an implant under the condition of not hurting an organism, so that the antibacterial property of the implantable stent is improved, and the problem of clinical postoperative explosive infection of the implant is solved; and more thoughts and means and beneficial exploration are provided for treatment of chronic refractory inflammation caused by biological membranes.

The utility model discloses a device for measuring a surface tension coefficient and an air viscosity coefficient based on bubbles, and mainly solves the problems that the conventional device for measuring the surface tension coefficient and the air viscosity coefficient is mutually independent and the experiment cost is relatively high. The device comprises a buffer, a variable pressure intensity device connected with the buffer, a thin tube assembly, a bubble hole assembly, a barometer, a sealing piece connected with the thin tube assembly, a backlight source arranged on one side of the bubble hole assembly, imaging equipment arranged on the other side of the bubble hole assembly, and image data processing equipment connected with the imaging equipment. Through the design, two simple and independent experiments in the traditional sense are integrated into an experiment with rich content through the bubble which is an interesting bridge and a new experiment method generated by the bubble, the experimental device has reliable theoretical basis and teaching value, the teaching experiment method is expanded, and the experiment efficiency is improved. And students can be guided to carefully research fluid mechanics knowledge behind the bubble phenomenon.

The invention relates to the technical field of model construction, in particular to a displacement fluid and shale rock imbibition law numerical simulation method and system. According to the method, by quantitatively analyzing the linear correlation degree of granularity and experimental capillary constant distribution and the disturbance degree of local feature points, regularization parameters of a regression algorithm are dynamically adjusted, and on the basis of accurately-calibrated capillary constants, a contact angle is determined by combining permeability characteristic data of probe liquid, so that the permeability of the probe liquid is determined. According to the method, shale surface free energy is obtained through surface energy component theoretical model decoupling, the interface action state of displacement fluid, shale and crude oil is reflected through a three-phase contact angle determined through a three-phase equilibrium relation, and the adhesion work needed by shale oil stripping is obtained. According to the method, the high-precision fitting model of the granularity and the capillary constant is established, and the surface energy component theory is combined, so that more accurate calculation of the shale oil stripping adhesion work is realized, and a reliable numerical simulation basis is provided for improving the shale oil recovery ratio.

This invention discloses a hydrophobicity rating system for superhydrophobic surfaces of energy equipment, relating to the field of hydrophobicity rating technology. The system includes a data acquisition module, an optimal parameter combination module, a sample preparation module, a hydrophobicity quantification and evaluation module, a test closed-loop calibration module, and a hydrophobicity rating classification and output module. These modules are interconnected, and through their collaborative operation, the system quantifies, performs closed-loop calibration, and classifies the hydrophobicity index of superhydrophobic samples of energy equipment with different microstructures. The closed-loop calibration process fully considers both anti-icing and weather resistance, significantly improving the accuracy and generalization ability of the hydrophobicity rating results. This solves the problems of inaccurate evaluation results and inability to adapt to extreme field conditions caused by traditional evaluation systems relying solely on conventional laboratory environments, single physical tests, and empirical thresholds for rating. This enhances the intelligence level of hydrophobicity rating evaluation for superhydrophobic surfaces of energy equipment.

The present invention relates to a rheo-optical method for the mechanical characterization of cellular spheroids and biopsies of biological tissues through: • The use of samples without special preparations; • The execution of compression tests with a load (weight) within standard plates for cell cultures; • The possibility of applying the load (weight) using inexpensive and easily obtainable equipment; • The possibility of conducting the tests in a sterile environment; • The acquisition of images of the sample and their analysis for calculating the elastic and viscous modulus.

The present invention provides a performance testing method for contaminated composite insulators. The testing method comprises: selecting a composite insulator and subjecting the composite insulator to an aging treatment using ultraviolet radiation to obtain an aged composite insulator; subjecting the surfaces of the original composite insulator and the aged composite insulator to a contamination treatment to obtain a contaminated composite insulator and a contaminated aged insulator; and independently performing leakage current testing, hydrophobicity testing, surface structure testing, and thermal resistance testing on the original composite insulator, the contaminated composite insulator, the aged composite insulator, and the contaminated aged insulator. The testing method can assess the impact of aging and surface contamination on the performance of composite insulators, thereby predicting the performance of composite insulators currently in use and ensuring the safety of transmission lines.

The utility model discloses a paper and water contact angle test sample pretreatment table device which comprises a working table, a sample table arranged at the top of the working table, mucilage glue arranged on the side wall of the sample table in a surrounding mode, a tension sensor used for monitoring tension changes of paper in real time arranged in the sample table, and a plurality of inclined track grooves formed in the periphery of the sample table. A linear motion sliding table is installed in the inclined rail groove, a telescopic rod is installed on a sliding plate of the linear motion sliding table, the output end of the telescopic rod is vertically upward and provided with a clamp used for clamping paper, an annular cutter is further arranged above the sample table, and the inner diameter of the annular cutter is smaller than the outer diameter of the sample table. The two ends of the annular cutter are connected with a lifting air cylinder arranged on the workbench. A bubble level for leveling the workbench is also arranged on one side of the sample table; by means of the design, the technical problems that in a traditional treatment mode, complex pretreatment, such as flat layer coating or special paper adopting, usually needs to be conducted on paper, the operation difficulty is high, and a test result deviates from a true value are solved.

The invention relates to a method for evaluating the adhesion performance of an asphalt-aggregate interface in an alkaline water environment, which comprises the following steps: respectively carrying out drying maintenance and soaking erosion on asphalt and aggregate to be tested to obtain an asphalt sample and an aggregate sample; acquiring the surface energy of the asphalt test reagent and the contact angle of the asphalt test reagent on the asphalt sample, and calculating the asphalt surface energy; acquiring the surface energy of the aggregate test reagent and the surface diffusion pressure between the aggregate test reagent and the aggregate sample, and calculating the surface energy of the aggregate; calculating dry asphalt-aggregate adhesion work and eroded asphalt-aggregate adhesion work according to the asphalt surface energy and the aggregate surface energy; calculating to obtain an alkaline degradation residue ratio index according to the dry asphalt-aggregate adhesion work and the eroded asphalt-aggregate adhesion work, and evaluating the adhesion performance of the asphalt-aggregate interface in the alkaline water environment. The method provided by the invention is helpful for analyzing the adhesiveness change of the asphalt-aggregate in immersion erosion, especially in an alkaline water environment, and provides a basis for preventing and reducing alkaline water damage.

The utility model discloses an experimental device for evaluating the influence of oil well production pressure difference on the stability of oil-water emulsion, which is characterized in that an outlet of a produced water temperature-resistant and pressure-resistant container is connected with an inlet of a trace water injection pump, and an outlet of a produced oil temperature-resistant and pressure-resistant container is connected with an inlet of a trace oil injection pump; outlets of the micro water injection pump and the micro oil injection pump are respectively connected with two inlets of the three-way valve, an outlet of the three-way valve is connected with a liquid phase inlet of the high-pressure emulsification tank, and a liquid outlet of the high-pressure emulsification tank is connected with an inlet of the storage type temperature-resistant and pressure-resistant container; an outlet of the storage type temperature-resistant and pressure-resistant container is connected with an oil pipe inlet of the small-sized double-wing well head device through a one-way pressure regulating valve, an oil nozzle sleeve outlet of the small-sized double-wing well head device is connected with a short pipe, and an outlet of the short pipe is inserted into a center hole of a large-end end cover of the transparent receiving cover. The side wall of the transparent receiving cover is provided with a transparent observation window and a high-speed camera. The device can simulate various working conditions in actual production, provides an emulsion stability evaluation report, and is beneficial to optimization of an oil field production process.

The invention discloses an optimal selection method of a surfactant for an oil reservoir, and belongs to the technical field of oil development. The optimal selection method comprises the following steps: preparing N pretreated parallel plunger samples, displacing a simulated oil layer with crude oil, aging the plunger samples under a formation condition until the plunger samples reach the wettability of an oil reservoir, and sampling and measuring an initial contact angle; performing oil displacement on the N aged plunger samples by using N surfactants to obtain corresponding oil displacement efficiency, and sampling and measuring a contact angle; comprehensive indexes are calculated based on the oil displacement efficiency, the contact angle and the initial contact angle, and the surfactants are sorted according to the comprehensive indexes. According to the method, a parallel plunger sample is selected to carry out an oil displacement efficiency experiment by adopting different surfactants in a simulated oil layer state, the performance of the surfactant is evaluated based on the oil displacement efficiency experiment and indexes such as wettability and oil displacement efficiency obtained before and after oil displacement implementation, finally a comprehensive index is selected, and the surfactant is preferably selected based on the comprehensive index.

The present invention relates to the field of metal processing and manufacturing technology, and discloses a method for measuring and calculating the surface tension of a metal melt. The method calculates the length 2a, height h, and bottom length 2l of a metal ball by identifying the coordinates of the endpoints of a melted metal ball. First, the coordinates of the endpoints of the metal ball are obtained through image recognition technology; then, the relevant geometric parameters of the ball are calculated. Next, using these geometric parameters, the surface tension of the metal melt is calculated according to a known physical model. Compared with traditional surface tension measurement methods, the present invention does not require complex ellipse fitting or the solution of contact angles, thereby simplifying the calculation process. In addition, the method of the present invention has high recognition accuracy, strong anti-interference ability, short calculation steps, and takes up less memory space after programming implementation. This method not only improves measurement efficiency, but also reduces the requirements for hardware equipment.

The invention discloses a compatibility evaluation method and device of a transformer structure material and an insulating liquid, electronic equipment and a storage medium, and belongs to the technical field of electrical insulation detection.The method comprises the steps that compatibility evaluation indexes of the transformer structure material and the insulating liquid are obtained; index characteristics corresponding to the compatibility evaluation indexes are calculated; wherein the index characteristics comprise trend intensity, fluctuation characteristics and mutation characteristics; according to the index characteristics, calculating a weight coefficient corresponding to each compatibility evaluation index, according to the index value of each compatibility evaluation index and the corresponding weight coefficient, calculating a compatibility comprehensive score of the transformer structure material and the insulating liquid, and then according to the compatibility comprehensive score, determining the compatibility of the transformer structure material and the insulating liquid. Therefore, by implementing the method, the problem that the compatibility of the transformer structure material and the insulating liquid cannot be evaluated in the prior art can be solved.

The invention discloses a modified graphene enhanced MF sponge for oil-water separation and performance testing equipment thereof, belongs to the technical field of graphene reduction, and solves the problems of complex reduction process and high energy consumption of an rGO composite material in the prior art. The modified graphene enhanced MF sponge comprises a sponge bearing part and a modified graphene layer anchored on a porous structure of the sponge bearing part, modified graphene comprises rGO-ZnO and rGO-ZnO / ZIF-8, and the sponge bearing part is melamine formaldehyde sponge, also called melamine formaldehyde sponge. According to the modified graphene enhanced MF sponge, through a photocatalytic reduction strategy, collaborative optimization of a super-hydrophobic surface, high adsorption capacity, excellent mechanical strength and green preparation is achieved, and the prepared rGO-ZnO / ZIF-8-coated MF sponge not only has good oil adsorption performance, but also has photocatalytic performance, so that the sponge has excellent performance in the field of oil-water separation.

The invention provides application of droplet merging induced bounce and a solid surface energy measuring system and method, and belongs to the technical field of surface science and precision measurement. Firstly, the invention provides an application of a droplet combination induced bounce phenomenon in solid surface energy measurement. Secondly, the invention provides a measuring system which comprises a liquid drop distribution unit, a merging induction unit, a high-speed image acquisition unit and a data processing and analyzing unit. Finally, a measuring method is provided, two liquid drops with similar sizes are prepared on the surface of a solid, and the liquid drops are induced to be combined and bounce; relevant parameters are extracted, and a Young's equation contact angle of the smooth surface is obtained based on an energy conservation model and a Cassie-Baxter model; and the total surface energy of the super-hydrophobic solid is obtained by simultaneously solving dispersion and polar components of the surface of the super-hydrophobic solid by using data of at least two liquids. According to the method, the surface energy is measured by using liquid drops and bounce, and the defect of low-surface-energy material measurement by a traditional contact angle method is overcome.

A method for determining physical parameters of a liquid (22) to be aspirated and / or dispensed by a laboratory automation device (10) comprises: pickup of a pipette (14) with the laboratory automation device (10); lowering the pipette (14) into a sample container (18) with the laboratory automation device (10), the sample container (18) containing the liquid (22); aspirating and dispensing air and liquid (22) with the laboratory automation device (10) in such a way, that a liquid level in the pipette (14) solely rises in a first step and solely lowers in a second step, such that an interior surface of the pipette (14) is wetted with liquid solely one time; and during aspirating and dispensing air and liquid (22), measuring a pressure curve (40) in the pipette (14) and determining the physical parameters from the pressure curve (40), the physical parameters comprising at least one of a surface tension, a wetting angle and a viscosity.

The invention discloses a teaching solid-liquid contact angle software and hardware measurement system based on a seating drop method, and the system comprises a hardware device and a software interaction and algorithm, the device can achieve the manual rotation of an XY plane and a YZ plane and the manual translation of an X axis and a Z axis, and the software interaction and algorithm comprises the steps: S1, enabling a plane where a camera is located to be perpendicular to a plane where a liquid drop is located, and carrying out the photographing to obtain a liquid drop picture; s2, carrying out graying processing on the liquid drop picture; s3, performing multi-stage interactive cutting on the grayed picture; s4, a Canny edge detection algorithm or a thresholding method is adopted, the contour extraction of the cut picture is completed through shading, iterative optimization is carried out, and liquid drop contour data are output; s5, drawing a liquid drop contour line on the grayscale image, drawing a base line, and calculating to obtain contact angle data; software provided by the invention is point-and-play, and the software can be matched and cooperated with designed hardware to complete a contact angle data acquisition function, and can also be independently used to process a liquid drop picture to obtain a contact angle numerical value.